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Flexible Installation and Operation
Available in drawer or fixed types, with both electric and manual operation options, YIFA Air Circuit Breakers provide versatile solutions to suit different application needs and maintenance requirements.
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Comprehensive Protection Functions
Equipped with intelligent trip devices, these circuit breakers deliver advanced protection against overload, short circuit, and single-phase grounding faults, ensuring reliable system safety.
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Smart Monitoring and Alarms
The intelligent controller offers real-time current and voltage display, along with overload alarms, enabling operators to quickly detect issues and prevent equipment damage.
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Enhanced Reliability with Self-Diagnosis
Featuring self-test functions for overheating and microcomputer self-diagnosis, the breakers ensure long-term operational stability and reduced risk of unexpected failures.
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How do I select the right ACB for my application?
1.Rated Current (In):
Select based on load calculated current, with 20%–30% margin (e.g., for 800A load, choose 1000A or 1250A).
2.Breaking Capacity (Icu/Ics):
Must exceed the system’s maximum short-circuit current (e.g., for 50kA system short circuit, choose ACB with Icu ≥65kA).
3.Poles:
3-pole for three-phase three-wire systems; 4-pole for three-phase four-wire systems (when neutral disconnection is required).
4.Protection Functions:
Basic: Overload + short-circuit protection.
Intelligent: Adds ground fault, undervoltage, overvoltage, single-phase earth fault protection. -
What should I do if the ACB trips and stops supplying power?
1.Identify the cause first:
Check the ACB panel for alarm indicators (e.g., overload, short circuit, ground fault).
Inspect connected equipment for abnormalities (smoke, odor, noise).
Do not reclose immediately: Blind reclosing may worsen the fault or cause repeated tripping.
2.Reset after troubleshooting:
For overload trips, reduce load or stagger equipment startup.
For short circuits or ground faults, repair wiring or faulty equipment.
After confirming the fault is cleared, move the handle from “TRIP” to “OFF,” then to “ON.” -
Does an ACB require regular maintenance?
1.Every 1–2 years:
Inspect contact wear (contact resistance test).
Clean arc chutes and insulation components (prevent dust-induced insulation failure).
Lubricate mechanical parts (e.g., handles, linkages).
2.Every 3–5 years:
Calibrate trip unit settings (e.g., overload long delay, short-circuit instantaneous).
Check secondary circuit connections for looseness.
3.Precautions:
Cut off power and post warning signs before maintenance.
Do not disassemble intelligent controllers or core mechanical parts without professional training.
